21548484647 has 2 divisors, whose sum is σ = 21548484648. Its totient is φ = 21548484646.

The previous prime is 21548484563. The next prime is 21548484653. The reversal of 21548484647 is 74648484512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21548484647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21548483647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10774242323 + 10774242324.

It is an arithmetic number, because the mean of its divisors is an integer number (10774242324).

Almost surely, 2^21548484647 is an apocalyptic number.

21548484647 is a deficient number, since it is larger than the sum of its proper divisors (1).

21548484647 is an equidigital number, since it uses as much as digits as its factorization.

21548484647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6881280, while the sum is 53.

The spelling of 21548484647 in words is "twenty-one billion, five hundred forty-eight million, four hundred eighty-four thousand, six hundred forty-seven".